/Engine/Source/Runtime/Landscape/Classes/LandscapeProxy.h
Render grass maps for the specified components
void RenderGrassMaps ( const [TArray](API\Runtime\Core\Containers\TArray)< [ULandscapeComponent](API\Runtime\Landscape\ULandscapeComponent) * > & LandscapeComponents, const [TArray](API\Runtime\Core\Containers\TArray)< [ULandscapeGrassType](API\Runtime\Landscape\ULandscapeGrassType) * > & GrassTypes )